Mortising-machine.



J. LEUKART. MORTISING MACHINE. APPLICATION FILED APLZG, 1911.

Patented Sept. 10, 1912.

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amdlea/(arz Attorney comm-Wm um. WASHINGTON. n-c.

J LEUKAgT MORTISING MACHINE.

APPLICATION FILED APR.26, 1911.

Patented Sept. 10,1912.

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WIT/VB Attorney .mcoB LEUKART, or comnvnans, OHid.

MonTr'sINc-MMHINE.

Specification of Letters Patent.

Patented Sept. 10,1912.

Application filed April 26,1911. Serial No. 623,479.

To all whom it may concern:

Be it known that I, JAUOB LEUKART, a citizen of the United States,residing at Columbus, in the county of Franklin and State of Ohio, haveinvented certain new and useful Improvements in Mortising- Machines andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enableothers skilled in theart to which it appertains to make and use the same,reference being hadto the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in automaticmortising apparatus and the object in view is to produce a simple andeflicient machine of this nature in which anelongated mortise may beformed in the block or board, the bottom of the mortise being straightand the end of the mortise concaved.

The invention consists further in the provision of an apparatus of thisnature so arranged that the feeding of the bit may be automatic and stopmechanism being provided to limit the depth of the mortise.

My invention comprises various other details of construction andcombinations and arrangements of parts which will be hereim after fullydescribed and then specifically defined in the appended claims.

I illustrate my invention in the accompanying drawings, in which Figure1 is a plan View in elevation of one side of the apparatus. Fig. 2 is a.similar view from the opposite side. Fig. 3 is a detail in elevation,parts being broken away. Fig. 4 is a transverse sectional view throughthe apparatus. Fig. 5 is a detail in elevation. Fig. 5 is a-sect-ionalviewtaken on. line 5-5 of Fig. 5. Fig. 6 is a sectional view showing theunder face of a detail of the invention, and Fig. 7 is a detailsectional view on line 77 of Fig. 1.

. Reference now being had to the details of the drawings by letter, Adesignates the frame of the apparatus whichhas clamping screws A mountedin threaded openings therein, the endsof said screws adapted to clampthe opposite faces of the board or block in which the mortise is to beformed.

Rising from said frame are the standards B connected together. at theirupper ends by a cross-piece C.

A movable skeleton frame, designated by letter 'D, has bosses D thereonmounted to have a vertical movement upon the standards B, and saidskeleton frame carries the operative parts of the machine. arms Dforming part of said skeleton frame, have a central hub portion which isapertured for the reception of the shaft E which is stationary and uponwhich a master gear wheel E, having gear teeth E upon the edge thereof,is journaled and a handle E is pivotally mounted upon said master wheelfor rotating the same. The hub portion of the master wheel has acircumferential series of gear teeth E which are in mesh with'theteeth'of a pinion wheel E which is journaled upon a stub shaft Esupported by one of said spider arms, and upon the hub of the gear wheelE is a series of circumferential gear teeth E which are in mesh with theteeth of a gear wheel E fixed to a shaft F journaled in one of saidspider arms of the skeleton frame, which gear connections form means fortransmit-- ting motion from the master wheel to the shaft F.

Fixed to the shaft F is a block G having an elongated slot Gr therein,in which a bearing block G is adjustably held. by means of the setscrews G and an integral pin G projects from said block and has a playin the elongated slot II formed in the swinging bit carrying member I,which lat ter has laterally extending recessed bosses I mounted upon theshaft E and a pin K car- Spider ried by said frame D. Said member I is uhollow its entire length and forms a bearing for the rotatablebit-actuating shaftN having a bit N fastened at its lower end. S'plinedto said shaft N is a gear wheel N which rotates within a transverse slotformed in the member I- and immediately below the lower end of the slotH and is in mesh with the teeth E of the master gear wheel. Saidswinging member is guided in its swinging movements in a slot formed inthe cross-piece d of the skeleton frame D.- Upon projections O of saidspider arms are mounted pivotal pins 0 to which the lower ends of links0 are pivctaly connected and their upper ends carry screws 0 whichengage interiorlythreaded bosses O which project from the member 0 whichlatter has acircumferential opening 0 to receive the upper end of theshaft N. Said shaft N has anannular groove N near its upper end in whichthe inner ends of said screws 0 engage, thus formlng a swlveledconnection between the latter and said shaft N.v

The feeding of the bit is produced by the 'following mechanism :A cam,designated by letter Q, is fastened to the shaft F and against said caman arm R of the angle lever R which is pivoted to the pin R is adaptedto ride, and R designates the second arm of said angle lever which isadapted, as the angle lever is rocked, to contact with a pin Sprojecting from the yoke S through the opposite walls of which the feedscrew T is adapted to rotate. Said pin S is adapted to be held withinthe path of the arm R by means of a coiled spring S mounted about thelower portion of the feed screw, one end of which is fastened to theyoke and its other end bears against said skeleton frame. Aspring-pressed pawl S is carried in a hollow projection S of the I yokeand is adapted to engage the teeth of the ratchet wheel S which is fixedto the feed screw. A collar S is fastened to the lower end of the feedscrew and has integral ratchet teeth S 8 thereon which are engaged by adog S which is fastened to the skeleton frame and is provided for thepurpose of preventing a reverse motion to the feed shaft. Pivotallymountedupon the pin T which is fastened to the under surface of across-piece C, is a plate T having an elongated slot therein for thereception of the pin T which latter passes through said cross-piece andhas a nut T upon its upper end. Said swinging plate T has a recessedportion T adapted to engage thethreads of the feed screw, affordingmeans for movingthe frame D and, through the medium of the latter,regulatethe cutting of the bit. In order to limit the depth of themortise, a etc is provided which consists of a collar which may be heldby means of a thumb screw WVf at various elevations upon the bar X whichis fastened at its lower end in the frame A and its upper end of thecross-piece C. Said collar is providedv with a laterally extending arm Nhaving a hooked end W which is disposed in the path of thespring-pressed dog S mounted in the V projecting boss upon said yoke Sin which the spring-pressed dog is mounted.

The operation of my apparatus will be as follows :-The parts beingadjusted in place, a rotary movement of the master wheel will, throughthe gear connections, cause a rotary movement to be imparted to the bit.A swinging motion will also be imparted to the member I in which the bitcarrying shaft is journaled through the medium of the pin Gr upon whichpin a sleeve g-is journaled and held thereon by means of a screw Gr andwhich sleeve moves in the elongated slot H. The adjustment of the blockcarrying said pin G obviously, will limit the swinging movement of thebit and regulate the length of the mortise. At each revolution of theshaft F, the cam thereon tilting the angle lever will cause anintermittent movement to be imparted to I the feed screw, regulating thecutting of the bit to'form the mortise and, by the peculiar constructionof the pivotal connection of the upper end of the bit carying shaft withthe boss which swings through the-medium of the links connected thereto,it will be noted that the bottom of the mortise, when completed, will bestraight. When it is desired to limit the depth of the mortise, the stopis set at such an elevation upon the rod upon which it is mounted sothat the springpressed dog at the outer end of the boss upon the yokewill engage said stop and hold the screw feed from rotation.

VVh-at I claim to be new is 1. An automatlc mortising machine comprisinga base, standards thereon, a frame movable upon said standards, a shaftjournaled in said frame, a gear wheel fixed to said shaft, a swingingmember mounted upon the latter, a bit carrying shaft rotatably journaledin said member, means for impartu'lg a longitudinal movement to the sameas 1t 1s rotated, gear mechanlsin intermediato said shafts, meansactuated by the gear wheel for causing the bit carrying member to swingupon its pivot, a rotatable feed screw, an adjustable plate carried bythe frame and engaging said screw, a yoke fixed tothe latter, a springupon the feed screw having one end fixed to the yoke and its other endbearing against the frame, a ratchet wheel fixed to the feed screw andmounted within said yoke, a ratchet collar fixed to the screw, a pawlsecured to the frame and engaging said ratchet collar, and aspring-pressed pawl carried by the yoke and engaging the ratchet wheelwithin the latter, a pivotal angle lever, a cam rotatable v with thegear mechanism-for rocking said angle lever, one end of the latteradapted to strikeagainst a projection of an end of the yoke, and meansfor arresting the feeding movement of the screw.

2. An automatic mortising machine comprising a base, standards thereon,a frame movable upon said standards, a shaft-joun' naled in said frame,a gear wheel fixed to said shaft, a swinging member mounted upon thelatter, a bit carrying shaft rotatably j ournaled in said member, meansfor imparting a longitudinal movement to the same as it is rotated, gearmechanism intermediate said shafts, means actuated by the gear wheel forcausing the bit carrying member to swing upon its pivot, a rotatablefeed screw,an'adjustable plate carried by the frame and en- 7 gagingsaid screw, a yoke fixed to the latter, a spring upon the feed screwhaving one end fixed to the yoke and its other end hearing against theframe, a ratchet wheel fixed to the feed screw and mounted within saidyoke, a ratchet collar fixed to the screw, a pawl secured to the frameand engaging said ratchet collar, a spring-pressed pawl carried by theyoke and engaging the ratchet wheel within the latter, a pivotal anglelever, a cam rotatable with the gear mechanism for rocking said anglelever, one end of, the latter adapted to strike against a projection ofan end of the yoke, an adjustable stop adapted to be positioned in thepath of the projecting end of the pawl within said yoke and designed tostop the feeding movement of the screw.

3. An automatic mortising machine comprising a base, standards thereon,a frame movable upon said standards, a shaft journaled in said frame, agear wheel fixed to said shaft, a swinging member mounted upon thelatter, a bit carrying shaft rotatably journaled in said member, meansfor imparting a longitudinal movement to the same as it is rotated, gearmechanism inter mediate said shafts, means actuated by the gear wheelfor causing the bit carrying member to swing upon its pivot, a rotatablefeed screw, an adjustable plate carried by the frame and engaging saidscrew, a yoke fixed to the latter, a spring upon the feed screw havingone end fixed to the yoke and its other end bearing against the frame, aratchet wheel fixed to the feed screw and mounted within said yoke, aratchet collar fixed to the screw, a pawl secured to the frame andengaging said ratchet collar, a spring-pressed pawl carried by the yokeand engaging the ratchet wheel within the latter, a pivotal angle lever,a cam rotatable with the gear mechanism for rocking said angle lever,one end of the latter adapted to strike against a projection of an endof the yoke, a bar rising from said base, an adjustable collar upon saidbar and provided with oscillating said member, a slot in the frame inwhich said member is guided as it swings, arms upon said frame, arotatable bit shaft journaled in said member, a member in which theupper end of said bit carrying shaft is swiveled, links pivotallyconnecting said member in which the shaft is swiveled to said arms, apinion fixed to the bit carrying shaft and in mesh with said gear wheel,a feed screw, a spring-pressed yoke fixed thereto, a pawl mounted uponsaid yoke, a ratchet wheel fixed to the feed screw within the yoke andengaged by said pawl, a ratchet collar upon the feed screw, a pawl fixedto the frame and engaging said collar, and an adjustable stop adapted tobe positioned in the path of the pro'ecting end of said pawl carried bythe yo e and designed to stop the feed of the screw.

In testimony whereof I hereunto afiix my signature in the presence oftwo witnesses.

JACOB LEUKART. Witnesses F. A. SIEGEL, A. GEIsE.

Copies of this patent may be obtained for iive cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

